I've run into an issue while recording audio with MXL-990 using Behringer U-Phoria UMC204HD.
We're recording audio with the above devices and video+audio with a video camera. The audio does not sync up with the video. It starts OK, but 10minutes in the audio comes in too fast - the video seems to lag behind. In other words: the sounds happen sooner than they should.
We've tried multiple cameras and multiple PCs for recording (linux, MacOSX), as well as multiple pieces of software (Audacity, Ardour, GarageBand, Oceanaudio), all yielding similar results. Changing the sample size/bitrate didn't help.
Here's an example of that. In the top track is the audio from the Behringer, and on the bottom track there's audio extracted from one of the cameras we've tested.
There are two claps in the recording, 10 minutes apart. The first one is in sync, the other one, not so much. You can see the discrepancy in the screenshot above
Could it be that our interface is faulty? How can we confirm that?